Rainbow Electronics T89C51AC2 - Manual (Page 100)

100
T89C51AC2
Rev. B – 19-Dec-01
18.4.4 External Data Memory
Characteristics Table 62. Symbol Description
Table 63. AC Parameters for a Variable Clock (F=40MHz)
Symbol Parameter
T
RLRH
RD Pulse Width
T
WLWH
WR Pulse Width
T
RLDV
RD to Valid Data In
T
RHDX
Data Hold After RD
T
RHDZ
Data Float After RD
T
LLDV
ALE to Valid Data In
T
AVDV
Address to Valid Data In
T
LLWL
ALE to WR or RD
T
AVWL
Address to WR or RD
T
QVWX
Data Valid to WR Transition
T
QVWH
Data set-up to WR High
T
WHQX
Data Hold After WR
T
RLAZ
RD Low to Address Float
T
WHLH
RD or WR High to ALE high
Symbol
Min Max
Units
T
RLRH
130 ns
T
WLWH
130 ns
T
RLDV
100 ns
T
RHDX
0 ns
T
RHDZ
30 ns
T
LLDV
160 ns
T
AVDV
165 ns
T
LLWL
50 100 ns
T
AVWL
75 ns
T
QVWX
10 ns
T
QVWH
160 ns
T
WHQX
15 ns
T
RLAZ
0 ns
T
WHLH
10 40 ns